Recorded Video is not Visible in my other Activity untill I reboot my Tablet Asus Transformer

I have created a Project having many activities. One activity is to record the video, that is working fine. I can see the recorded video in my specified folder without restart my tablet.

But when I try to find all the videos in that folder in some other activity using query, see code below. Then I can't see my recorded video until I restart my tablet. I can see just old recorded videos before starting my tablet. I couldn't understand this strange behavior.